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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac82f6292760a5c8b740425bd23540f3599e9f316acfa3d707b6db25f6db063' 
  AND token = 'g2TCJXLWBRp6Xuijs97pFN1+1etLhJ8LrXIO0C0p7PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}